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US 12,725,994 B2Granted
Rare-earth doped fiber and fiber laser apparatus
AssigneeFujikura Ltd.
InventorRintaro Kitahara
Life of this patent
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Abstract
A rare-earth doped fiber includes: a core having a radius R and having a doped region to which a rare-earth element has been doped, the doped region ranging from a center of the core to a radius Rre; and a cladding surrounding a circumference of the core and having a refractive index lower than a refractive index of the core. A normalized frequency V at an operating wavelength is greater than or equal to 2.4 and less than or equal to 4.5. The radius Rre is in a range of 0<Rre< ( 0.0247 V 2 - 0.3353 V + 1.6474 ) R .
Claims10
A rare-earth doped fiber comprising:
- a core having a radius R and comprising a doped region to which a rare-earth element has been doped, the doped region ranging from a center of the core to a radius Rre;
- and
- a cladding surrounding a circumference of the core and having a refractive index lower than a refractive index of the core,
- wherein a normalized frequency V at an operating wavelength is greater than or equal to 2.4 and less than or equal to 4.5, and
- the radius Rre is in a range of 0<Rre<(0.0247V2−0.3353V+1.6474) R.
2 more elements
Dependencies are inferred from the claim text.